import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login'
import Home from '../components/Home'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home
  }
]

const router = new VueRouter({
  routes
})

//  挂载路由导航守卫，作页面访问权限控制
router.beforeEach((to, from, next) => {
  //  to 将要访问的路径
  //  from 代表从哪个路径跳转而来
  //  next 是一个函数，表示放行
  //  next() 放行  next('/login') 强制跳转

  //  登录页放行
  if (to.path === '/login') return next()
  //  获取token,没有token强制跳转到登录页
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) {
    return next('/login')
  }
  next()
})

export default router
